-LRB- CNN -RRB- -- Police are investigating whether or what family issues might have prompted a California man to shoot six of his family members -- killing five -- before committing suicide . His wife was critically wounded .

Authorities on Tuesday said Devan Kalathat , 42 , shot his family Sunday night at his Santa Clara townhouse , killing two adults and three children .

Kalathat killed his 11-year-old son , Akhil Dev ; his 4-year-old daughter , Negha Dev ; his 35-year-old brother-in-law Ashok Appu Poothemkandi ; Poothemkandi 's 25-year-old wife , Suchitra Sivaraman ; and the couple 's 11-month-old daughter , Ahana .

Kalathat 's 34-year-old wife , who was not identified , sustained multiple gunshot wounds and remains in critical condition , said Lt. Phil Cooke .

`` Family dynamics and personal relationships may have played a factor , '' Cooke told reporters Tuesday . He said Kalathat was employed as an engineer and nothing indicated he was facing `` layoff or financial crisis . ''

Investigators believe Kalathat used two .45 - caliber semi-automatic pistols , both of which he owned .

Cooke said Kalathat bought one of the pistols in February and the other nearly two weeks ago -- roughly the same time his wife 's brother , Poothemkandi , arrived in California from India with Suchitra Sivaraman and Ahana .

Cooke noted that Poothemkandi was an `` educated professional '' with plans to stay in the Bay Area to work on a project for a high-tech firm .

Police were called after a neighbor noticed Kalathat 's wounded wife outside the home around 8:30 p.m. -LRB- 11:30 p.m. ET -RRB- , Cooke said . When police arrived , other victims were found around the kitchen and dining room in what Cooke described as `` a very gruesome scene . ''

The family shooting comes just two months after a Los Angeles father who , after he and his wife were fired from their jobs , killed her and their five young children before turning the gun on himself .

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Devan Kalathat , 42 , shot six of his family members before turning gun on himself

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His wife , in critical condition , is the only survivor of the attack

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Police : `` Family dynamics and personal relationships may have played a factor ''

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Police say man was not facing job loss or financial problems